Jack



Oct, 13 @1 1,556,947

c. c. MADSEN ET AL' JACK Filed Oct. 11. 1924 2 Sheets-Sheet 1 Oct. 13,1925. 1,556,947

C. C- MADSEN ET AL JACK Filed Oct. 11. 1924 2 Sheets-Sheet 2 .IQQI

Fatented Oct. 13, 1925.

UNITED STATES 1,556,947 PATENT OFFICE.

cam. c. mnnsnn AND mass A. KALTOFT, or no'rn'ron, mmmasora.

JACK.

e Application filed October 11, 1924. Serial No. 743,047.

' ticularly to a device of this general character especially designedand adapted for use in connection with motor driven vehicles and it isan object of the invention to provide a jack constructed in a novel andimproved manner whereby a relatively low frame may be employed and atthe same time permitting an efiective' lift of thecar.

Another object of the inventionis to'provide a novel and improved deviceof this general character which maybe employed to advantage inconnection with an axle of a motor driven vehicle or the like which ispositioned unusually low.

The invention consists in the'details of construction and in thecombination and arrangement of the several parts of our improved jackwhereby certain important advantages are attained and the devicerendered simpler, less expensive and otherwise more convenient andadvantageous for use, as will be hereinafter more fully set forth. Thenovel features of our invention will hereinafter be definitely claimed.

In order that our invention may be the better understood, we will nowproceed to describe the same with reference to the accompanyingdrawings, wherein I Figure 1 IS a view in elevation illustrating a jackconstructed in accordance with'an embodiment of our invention;

Figure 2 is a vertical sectional view of the device as illustrated inFigural; I Figure 3 is a view partly in elevation and partly in sectionof the device as herein disclosed, the line of section beingsubstantially at right angles to that of Flgure 2;

Figure 4 is a view partly in top plan and partly in horizontal sectionof the device,

as herein disclosed;

As disclosed in the accompanying draw! 'ings, B denotes the base orframe of our improved jack which is relatively low. The base B comprisesa cylindrical body l provided at its lower endwith 'a supporting tocertain improve plate 2 herein disclosed as integrally formed therewith.

The opposite orupper end of the cylindrical body 1' is closed by thehead or plate 3 partially extending within the body 1 and held or lockedin applied position by the screw 4 or its equivalent.

The central portion of the head or plate 3 has threaded therethrough thetubular jack screw 5 the lower end portion of which being defined by anoutstanding flange 6 fitting within an upstanding annular holding flange7 carried by the plate 8. The' swiveled connection between the stem 5and flanges 6 and 7 coact in a manner to effect a the plate 8.

The plate 8 is non-rotatable and as herein setforth is held againstrotation by the diametrically opposed pairs of ears 9 each pair of whichreceiving therebetween a rib 1O carried by the inner wall of thecylindrical member 1. While the ears 9 coact with the ribs 10 to holdthe plate 8 against rotation yet no hindrance-or obstruction is offeredto the. movement of the plate 8 lengthwise of the body 1 as the jackscrew 5 has longitudinal movement in either direction.

The bore of the jack screw 5 is interiorly threaded, said interiorthreads 12 being reversed with respect to the exterior threads 14. Inthreaded engagement with said interior threads 12' through the outer endof the jack screw 5 is an outer or upper jack screw 15. The outerextremity of the screw 15 is provided with the lifting head or rest 16which may be formed or designed as desired. Fixed to the plate 8 at theaxial ,center thereof is an upstanding bar or post 17 angular in crosssection and of desired length, The upper or outer end portion of whichbeing received within the bore 18 of the jack screw 15 said bore beingof substantially the same cross sectionalconfiguration as that of thebar or post 17. This bar or post 17 operates to hold the jack screw 5against rotation so that as the screw 5 is re ated in'one' direction thescrew 15 will beica'used to have lo itndinal move- -ment in the samegeneral irection as the longitudinal movement of the screw 5.

It is to be noted that the bar or post 17 terminates a distance inwardlyof the outer end of the screw 5 so that upon outward movement of thescrew 15 a predetermined distance, the bar or post 17 will be disengagedfrom the screw 15. By'this means it is assured that the screw 15 willnot accidentally separate from the screw 5.

The screw 5 is provided therealong with a longitudinalguideway 19 inwhich is received an inwardly directed lug 20- carried by the annulargear 21, said gear being arran ed Within the cylindrical bod 1' of thebase B. By this mounting of t c gear 21 the screw 5 may be readilyrotated and at the same time be capable of the requisite endwisemovement. The gear 21 is posi: tioned above and operatively engaged witha second gear 22 which is properly positioned with respect to the gear21 through an opening 23 provided in an upper portion of the wall of thebody 1. This gear 22 is carried by a shaft 24 rotatably supported by thebearing 25. This bearing 25 is comprised in an arm 26 supported by thebody 1 and disposed across the opening 23. The outer end portion of theshaft 24 is provided with a notched wheel 27 with which coacts in awell-known manner the ratchet lever 28 whereby the gear 22 may berotated in either direction as. the occasions of practice maynecessitate.

A jack constructed in accordance with an embodiment of ourinve'ntion isparticularly adapted for use in connection with motor driven vehiclesand especially where the axle is unusually low and while the base orframe B is materially low insize yet the Tcjrews 5 and 15 cooperate toeffect a high it. y

From the foregoing description it is throught to be obvious that a jackcon-- structed in accordance with our invention is particularly welladapted for use by reason I of the convenience and facility with whichit may be assembled and operated, and it will also be obvious that ourinvention is susceptible of somechange and modification withoutdeparting from the'principles and spirit thereof and for this reason wedo not wish to be understood as limiting ourselves to the precisearrangement and formation of the several parts herein shown in carry-ving out our invention in practice except as hereinafter claimed. Weclaim v A' jack comprising, in combination, a tubular base having itsupper end open and provided in its side wall with an opening, anarmsupported by the base exteriorly thereof and disposed across theopening, a head closing the open end of the base, a tubular jack screwthreaded through said head, a plate in swiveled connection with theinserted end portion of the jack screw, coacting means carried by saidsecond named plate and the wall of the member for holding the plateagainst rotation independently of the member, a second jack screwthreaded into the first'jack screw through the outer end thereof, saidsecond jack screw having its inserted portion provided with a bore, an

upstandin post carried by the second plate and exten ing within the boreof the second jack screw, said post and bore being angular in crosssection to hold the second jack screw against rotation when the post isengaged within the bore of said second jack screw, said post having itsupper end terminating inwardly of the outer end of the first named jackscrew, a gear within \the first. member and surrounding :said firstnamed screw, means-for keying said gear to the first named screw'forrotation with said screw but permitting said screw to run therethrough,a gear rotatably supported by the arm extending across the opening inthe CARL c. MADSE'N. JESS A. KAnro-F r;

